Node.js mongoose connect error

Question

I have node.js project which contain mongo database. I use mongoose schema. 3 file in project are: index.js, users.js and db.js. when I want to connect mongodb via mongoose, I can't. Here is my code. when it runs it says

"error is: TypeError: parseFn is not a function."

pls help!!

db.js

const mongoose=require('mongoose');

mongoose.Promise = require('bluebird');
mongoose.connect('mongodb://localhost:27017/myDB', { useNewUrlParser:true}).then(
(res) => {
console.log("Success!!.")
}).catch((e) => {console.log("error is: " + e);});

users.js

var mongoose = require('mongoose');

var Schema = mongoose.Schema;

var userSchema= new Schema({
id:{type : Number, required: true, unique:true},
username : String,
password : String }, {collection: 'userTB'});

var userS= mongoose.model('userTBL', userSchema);

module.exports=userS;

index.js

...
var db=require('./app_server/models/db');
...

Answer 1

I'm not sure but I guess I faced the same kinda error when I was a newbie in MongoDB. If I'm not wrong this error is because you haven't actually started your local MongoDB server yet. You actually have to start the MongoDB server manually to connect to it. The command to start mongo server from the terminal is something like:

mongod --dbpath /data/db